1 Institut National de Recherche Biomédicale, Kinshasa, Democratic Republic of Congo; Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research, Frederick, MD, USA. Electronic address: olivier.tshianimbaya@nih.gov.
2 Institut National de Recherche Biomédicale, Kinshasa, Democratic Republic of Congo.
3 National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.